Pileus Git - ~andy/linux/blob - net/batman-adv/translation-table.c

   1 /*
   2  * Copyright (C) 2007-2011 B.A.T.M.A.N. contributors:
   3  *
   4  * Marek Lindner, Simon Wunderlich
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of version 2 of the GNU General Public
   8  * License as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  18  * 02110-1301, USA
  19  *
  20  */
  21
  22 #include "main.h"
  23 #include "translation-table.h"
  24 #include "soft-interface.h"
  25 #include "hash.h"
  26 #include "originator.h"
  27
  28 static void hna_local_purge(struct work_struct *work);
  29 static void _hna_global_del_orig(struct bat_priv *bat_priv,
  30                                  struct hna_global_entry *hna_global_entry,
  31                                  char *message);
  32
  33 static void hna_local_start_timer(struct bat_priv *bat_priv)
  34 {
  35         INIT_DELAYED_WORK(&bat_priv->hna_work, hna_local_purge);
  36         queue_delayed_work(bat_event_workqueue, &bat_priv->hna_work, 10 * HZ);
  37 }
  38
  39 int hna_local_init(struct bat_priv *bat_priv)
  40 {
  41         if (bat_priv->hna_local_hash)
  42                 return 1;
  43
  44         bat_priv->hna_local_hash = hash_new(1024);
  45
  46         if (!bat_priv->hna_local_hash)
  47                 return 0;
  48
  49         atomic_set(&bat_priv->hna_local_changed, 0);
  50         hna_local_start_timer(bat_priv);
  51
  52         return 1;
  53 }
  54
  55 void hna_local_add(struct net_device *soft_iface, uint8_t *addr)
  56 {
  57         struct bat_priv *bat_priv = netdev_priv(soft_iface);
  58         struct hna_local_entry *hna_local_entry;
  59         struct hna_global_entry *hna_global_entry;
  60         int required_bytes;
  61
  62         spin_lock_bh(&bat_priv->hna_lhash_lock);
  63         rcu_read_lock();
  64         hna_local_entry =
  65                 ((struct hna_local_entry *)hash_find(bat_priv->hna_local_hash,
  66                                                      compare_orig, choose_orig,
  67                                                      addr));
  68         rcu_read_unlock();
  69         spin_unlock_bh(&bat_priv->hna_lhash_lock);
  70
  71         if (hna_local_entry) {
  72                 hna_local_entry->last_seen = jiffies;
  73                 return;
  74         }
  75
  76         /* only announce as many hosts as possible in the batman-packet and
  77            space in batman_packet->num_hna That also should give a limit to
  78            MAC-flooding. */
  79         required_bytes = (bat_priv->num_local_hna + 1) * ETH_ALEN;
  80         required_bytes += BAT_PACKET_LEN;
  81
  82         if ((required_bytes > ETH_DATA_LEN) ||
  83             (atomic_read(&bat_priv->aggregated_ogms) &&
  84              required_bytes > MAX_AGGREGATION_BYTES) ||
  85             (bat_priv->num_local_hna + 1 > 255)) {
  86                 bat_dbg(DBG_ROUTES, bat_priv,
  87                         "Can't add new local hna entry (%pM): "
  88                         "number of local hna entries exceeds packet size\n",
  89                         addr);
  90                 return;
  91         }
  92
  93         bat_dbg(DBG_ROUTES, bat_priv,
  94                 "Creating new local hna entry: %pM\n", addr);
  95
  96         hna_local_entry = kmalloc(sizeof(struct hna_local_entry), GFP_ATOMIC);
  97         if (!hna_local_entry)
  98                 return;
  99
 100         memcpy(hna_local_entry->addr, addr, ETH_ALEN);
 101         hna_local_entry->last_seen = jiffies;
 102
 103         /* the batman interface mac address should never be purged */
 104         if (compare_eth(addr, soft_iface->dev_addr))
 105                 hna_local_entry->never_purge = 1;
 106         else
 107                 hna_local_entry->never_purge = 0;
 108
 109         spin_lock_bh(&bat_priv->hna_lhash_lock);
 110
 111         hash_add(bat_priv->hna_local_hash, compare_orig, choose_orig,
 112                  hna_local_entry);
 113         bat_priv->num_local_hna++;
 114         atomic_set(&bat_priv->hna_local_changed, 1);
 115
 116         spin_unlock_bh(&bat_priv->hna_lhash_lock);
 117
 118         /* remove address from global hash if present */
 119         spin_lock_bh(&bat_priv->hna_ghash_lock);
 120
 121         rcu_read_lock();
 122         hna_global_entry = ((struct hna_global_entry *)
 123                                 hash_find(bat_priv->hna_global_hash,
 124                                           compare_orig, choose_orig, addr));
 125         rcu_read_unlock();
 126
 127         if (hna_global_entry)
 128                 _hna_global_del_orig(bat_priv, hna_global_entry,
 129                                      "local hna received");
 130
 131         spin_unlock_bh(&bat_priv->hna_ghash_lock);
 132 }
 133
 134 int hna_local_fill_buffer(struct bat_priv *bat_priv,
 135                           unsigned char *buff, int buff_len)
 136 {
 137         struct hashtable_t *hash = bat_priv->hna_local_hash;
 138         struct hna_local_entry *hna_local_entry;
 139         struct element_t *bucket;
 140         int i;
 141         struct hlist_node *walk;
 142         struct hlist_head *head;
 143         int count = 0;
 144
 145         spin_lock_bh(&bat_priv->hna_lhash_lock);
 146
 147         for (i = 0; i < hash->size; i++) {
 148                 head = &hash->table[i];
 149
 150                 hlist_for_each_entry(bucket, walk, head, hlist) {
 151
 152                         if (buff_len < (count + 1) * ETH_ALEN)
 153                                 break;
 154
 155                         hna_local_entry = bucket->data;
 156                         memcpy(buff + (count * ETH_ALEN), hna_local_entry->addr,
 157                                ETH_ALEN);
 158
 159                         count++;
 160                 }
 161         }
 162
 163         /* if we did not get all new local hnas see you next time  ;-) */
 164         if (count == bat_priv->num_local_hna)
 165                 atomic_set(&bat_priv->hna_local_changed, 0);
 166
 167         spin_unlock_bh(&bat_priv->hna_lhash_lock);
 168         return count;
 169 }
 170
 171 int hna_local_seq_print_text(struct seq_file *seq, void *offset)
 172 {
 173         struct net_device *net_dev = (struct net_device *)seq->private;
 174         struct bat_priv *bat_priv = netdev_priv(net_dev);
 175         struct hashtable_t *hash = bat_priv->hna_local_hash;
 176         struct hna_local_entry *hna_local_entry;
 177         int i;
 178         struct hlist_node *walk;
 179         struct hlist_head *head;
 180         struct element_t *bucket;
 181         size_t buf_size, pos;
 182         char *buff;
 183
 184         if (!bat_priv->primary_if) {
 185                 return seq_printf(seq, "BATMAN mesh %s disabled - "
 186                                "please specify interfaces to enable it\n",
 187                                net_dev->name);
 188         }
 189
 190         seq_printf(seq, "Locally retrieved addresses (from %s) "
 191                    "announced via HNA:\n",
 192                    net_dev->name);
 193
 194         spin_lock_bh(&bat_priv->hna_lhash_lock);
 195
 196         buf_size = 1;
 197         /* Estimate length for: " * xx:xx:xx:xx:xx:xx\n" */
 198         for (i = 0; i < hash->size; i++) {
 199                 head = &hash->table[i];
 200
 201                 hlist_for_each(walk, head)
 202                         buf_size += 21;
 203         }
 204
 205         buff = kmalloc(buf_size, GFP_ATOMIC);
 206         if (!buff) {
 207                 spin_unlock_bh(&bat_priv->hna_lhash_lock);
 208                 return -ENOMEM;
 209         }
 210         buff[0] = '\0';
 211         pos = 0;
 212
 213         for (i = 0; i < hash->size; i++) {
 214                 head = &hash->table[i];
 215
 216                 hlist_for_each_entry(bucket, walk, head, hlist) {
 217                         hna_local_entry = bucket->data;
 218
 219                         pos += snprintf(buff + pos, 22, " * %pM\n",
 220                                         hna_local_entry->addr);
 221                 }
 222         }
 223
 224         spin_unlock_bh(&bat_priv->hna_lhash_lock);
 225
 226         seq_printf(seq, "%s", buff);
 227         kfree(buff);
 228         return 0;
 229 }
 230
 231 static void _hna_local_del(void *data, void *arg)
 232 {
 233         struct bat_priv *bat_priv = (struct bat_priv *)arg;
 234
 235         kfree(data);
 236         bat_priv->num_local_hna--;
 237         atomic_set(&bat_priv->hna_local_changed, 1);
 238 }
 239
 240 static void hna_local_del(struct bat_priv *bat_priv,
 241                           struct hna_local_entry *hna_local_entry,
 242                           char *message)
 243 {
 244         bat_dbg(DBG_ROUTES, bat_priv, "Deleting local hna entry (%pM): %s\n",
 245                 hna_local_entry->addr, message);
 246
 247         hash_remove(bat_priv->hna_local_hash, compare_orig, choose_orig,
 248                     hna_local_entry->addr);
 249         _hna_local_del(hna_local_entry, bat_priv);
 250 }
 251
 252 void hna_local_remove(struct bat_priv *bat_priv,
 253                       uint8_t *addr, char *message)
 254 {
 255         struct hna_local_entry *hna_local_entry;
 256
 257         spin_lock_bh(&bat_priv->hna_lhash_lock);
 258
 259         rcu_read_lock();
 260         hna_local_entry = (struct hna_local_entry *)
 261                 hash_find(bat_priv->hna_local_hash, compare_orig, choose_orig,
 262                           addr);
 263         rcu_read_unlock();
 264
 265         if (hna_local_entry)
 266                 hna_local_del(bat_priv, hna_local_entry, message);
 267
 268         spin_unlock_bh(&bat_priv->hna_lhash_lock);
 269 }
 270
 271 static void hna_local_purge(struct work_struct *work)
 272 {
 273         struct delayed_work *delayed_work =
 274                 container_of(work, struct delayed_work, work);
 275         struct bat_priv *bat_priv =
 276                 container_of(delayed_work, struct bat_priv, hna_work);
 277         struct hashtable_t *hash = bat_priv->hna_local_hash;
 278         struct hna_local_entry *hna_local_entry;
 279         int i;
 280         struct hlist_node *walk, *safe;
 281         struct hlist_head *head;
 282         struct element_t *bucket;
 283         unsigned long timeout;
 284
 285         spin_lock_bh(&bat_priv->hna_lhash_lock);
 286
 287         for (i = 0; i < hash->size; i++) {
 288                 head = &hash->table[i];
 289
 290                 hlist_for_each_entry_safe(bucket, walk, safe, head, hlist) {
 291                         hna_local_entry = bucket->data;
 292
 293                         timeout = hna_local_entry->last_seen;
 294                         timeout += LOCAL_HNA_TIMEOUT * HZ;
 295
 296                         if ((!hna_local_entry->never_purge) &&
 297                             time_after(jiffies, timeout))
 298                                 hna_local_del(bat_priv, hna_local_entry,
 299                                         "address timed out");
 300                 }
 301         }
 302
 303         spin_unlock_bh(&bat_priv->hna_lhash_lock);
 304         hna_local_start_timer(bat_priv);
 305 }
 306
 307 void hna_local_free(struct bat_priv *bat_priv)
 308 {
 309         if (!bat_priv->hna_local_hash)
 310                 return;
 311
 312         cancel_delayed_work_sync(&bat_priv->hna_work);
 313         hash_delete(bat_priv->hna_local_hash, _hna_local_del, bat_priv);
 314         bat_priv->hna_local_hash = NULL;
 315 }
 316
 317 int hna_global_init(struct bat_priv *bat_priv)
 318 {
 319         if (bat_priv->hna_global_hash)
 320                 return 1;
 321
 322         bat_priv->hna_global_hash = hash_new(1024);
 323
 324         if (!bat_priv->hna_global_hash)
 325                 return 0;
 326
 327         return 1;
 328 }
 329
 330 void hna_global_add_orig(struct bat_priv *bat_priv,
 331                          struct orig_node *orig_node,
 332                          unsigned char *hna_buff, int hna_buff_len)
 333 {
 334         struct hna_global_entry *hna_global_entry;
 335         struct hna_local_entry *hna_local_entry;
 336         int hna_buff_count = 0;
 337         unsigned char *hna_ptr;
 338
 339         while ((hna_buff_count + 1) * ETH_ALEN <= hna_buff_len) {
 340                 spin_lock_bh(&bat_priv->hna_ghash_lock);
 341
 342                 hna_ptr = hna_buff + (hna_buff_count * ETH_ALEN);
 343                 rcu_read_lock();
 344                 hna_global_entry = (struct hna_global_entry *)
 345                         hash_find(bat_priv->hna_global_hash, compare_orig,
 346                                   choose_orig, hna_ptr);
 347                 rcu_read_unlock();
 348
 349                 if (!hna_global_entry) {
 350                         spin_unlock_bh(&bat_priv->hna_ghash_lock);
 351
 352                         hna_global_entry =
 353                                 kmalloc(sizeof(struct hna_global_entry),
 354                                         GFP_ATOMIC);
 355
 356                         if (!hna_global_entry)
 357                                 break;
 358
 359                         memcpy(hna_global_entry->addr, hna_ptr, ETH_ALEN);
 360
 361                         bat_dbg(DBG_ROUTES, bat_priv,
 362                                 "Creating new global hna entry: "
 363                                 "%pM (via %pM)\n",
 364                                 hna_global_entry->addr, orig_node->orig);
 365
 366                         spin_lock_bh(&bat_priv->hna_ghash_lock);
 367                         hash_add(bat_priv->hna_global_hash, compare_orig,
 368                                  choose_orig, hna_global_entry);
 369
 370                 }
 371
 372                 hna_global_entry->orig_node = orig_node;
 373                 spin_unlock_bh(&bat_priv->hna_ghash_lock);
 374
 375                 /* remove address from local hash if present */
 376                 spin_lock_bh(&bat_priv->hna_lhash_lock);
 377
 378                 hna_ptr = hna_buff + (hna_buff_count * ETH_ALEN);
 379                 rcu_read_lock();
 380                 hna_local_entry = (struct hna_local_entry *)
 381                         hash_find(bat_priv->hna_local_hash, compare_orig,
 382                                   choose_orig, hna_ptr);
 383                 rcu_read_unlock();
 384
 385                 if (hna_local_entry)
 386                         hna_local_del(bat_priv, hna_local_entry,
 387                                       "global hna received");
 388
 389                 spin_unlock_bh(&bat_priv->hna_lhash_lock);
 390
 391                 hna_buff_count++;
 392         }
 393
 394         /* initialize, and overwrite if malloc succeeds */
 395         orig_node->hna_buff = NULL;
 396         orig_node->hna_buff_len = 0;
 397
 398         if (hna_buff_len > 0) {
 399                 orig_node->hna_buff = kmalloc(hna_buff_len, GFP_ATOMIC);
 400                 if (orig_node->hna_buff) {
 401                         memcpy(orig_node->hna_buff, hna_buff, hna_buff_len);
 402                         orig_node->hna_buff_len = hna_buff_len;
 403                 }
 404         }
 405 }
 406
 407 int hna_global_seq_print_text(struct seq_file *seq, void *offset)
 408 {
 409         struct net_device *net_dev = (struct net_device *)seq->private;
 410         struct bat_priv *bat_priv = netdev_priv(net_dev);
 411         struct hashtable_t *hash = bat_priv->hna_global_hash;
 412         struct hna_global_entry *hna_global_entry;
 413         int i;
 414         struct hlist_node *walk;
 415         struct hlist_head *head;
 416         struct element_t *bucket;
 417         size_t buf_size, pos;
 418         char *buff;
 419
 420         if (!bat_priv->primary_if) {
 421                 return seq_printf(seq, "BATMAN mesh %s disabled - "
 422                                   "please specify interfaces to enable it\n",
 423                                   net_dev->name);
 424         }
 425
 426         seq_printf(seq, "Globally announced HNAs received via the mesh %s\n",
 427                    net_dev->name);
 428
 429         spin_lock_bh(&bat_priv->hna_ghash_lock);
 430
 431         buf_size = 1;
 432         /* Estimate length for: " * xx:xx:xx:xx:xx:xx via xx:xx:xx:xx:xx:xx\n"*/
 433         for (i = 0; i < hash->size; i++) {
 434                 head = &hash->table[i];
 435
 436                 hlist_for_each(walk, head)
 437                         buf_size += 43;
 438         }
 439
 440         buff = kmalloc(buf_size, GFP_ATOMIC);
 441         if (!buff) {
 442                 spin_unlock_bh(&bat_priv->hna_ghash_lock);
 443                 return -ENOMEM;
 444         }
 445         buff[0] = '\0';
 446         pos = 0;
 447
 448         for (i = 0; i < hash->size; i++) {
 449                 head = &hash->table[i];
 450
 451                 hlist_for_each_entry(bucket, walk, head, hlist) {
 452                         hna_global_entry = bucket->data;
 453
 454                         pos += snprintf(buff + pos, 44,
 455                                         " * %pM via %pM\n",
 456                                         hna_global_entry->addr,
 457                                         hna_global_entry->orig_node->orig);
 458                 }
 459         }
 460
 461         spin_unlock_bh(&bat_priv->hna_ghash_lock);
 462
 463         seq_printf(seq, "%s", buff);
 464         kfree(buff);
 465         return 0;
 466 }
 467
 468 static void _hna_global_del_orig(struct bat_priv *bat_priv,
 469                                  struct hna_global_entry *hna_global_entry,
 470                                  char *message)
 471 {
 472         bat_dbg(DBG_ROUTES, bat_priv,
 473                 "Deleting global hna entry %pM (via %pM): %s\n",
 474                 hna_global_entry->addr, hna_global_entry->orig_node->orig,
 475                 message);
 476
 477         hash_remove(bat_priv->hna_global_hash, compare_orig, choose_orig,
 478                     hna_global_entry->addr);
 479         kfree(hna_global_entry);
 480 }
 481
 482 void hna_global_del_orig(struct bat_priv *bat_priv,
 483                          struct orig_node *orig_node, char *message)
 484 {
 485         struct hna_global_entry *hna_global_entry;
 486         int hna_buff_count = 0;
 487         unsigned char *hna_ptr;
 488
 489         if (orig_node->hna_buff_len == 0)
 490                 return;
 491
 492         spin_lock_bh(&bat_priv->hna_ghash_lock);
 493
 494         while ((hna_buff_count + 1) * ETH_ALEN <= orig_node->hna_buff_len) {
 495                 hna_ptr = orig_node->hna_buff + (hna_buff_count * ETH_ALEN);
 496                 rcu_read_lock();
 497                 hna_global_entry = (struct hna_global_entry *)
 498                         hash_find(bat_priv->hna_global_hash, compare_orig,
 499                                   choose_orig, hna_ptr);
 500                 rcu_read_unlock();
 501
 502                 if ((hna_global_entry) &&
 503                     (hna_global_entry->orig_node == orig_node))
 504                         _hna_global_del_orig(bat_priv, hna_global_entry,
 505                                              message);
 506
 507                 hna_buff_count++;
 508         }
 509
 510         spin_unlock_bh(&bat_priv->hna_ghash_lock);
 511
 512         orig_node->hna_buff_len = 0;
 513         kfree(orig_node->hna_buff);
 514         orig_node->hna_buff = NULL;
 515 }
 516
 517 static void hna_global_del(void *data, void *arg)
 518 {
 519         kfree(data);
 520 }
 521
 522 void hna_global_free(struct bat_priv *bat_priv)
 523 {
 524         if (!bat_priv->hna_global_hash)
 525                 return;
 526
 527         hash_delete(bat_priv->hna_global_hash, hna_global_del, NULL);
 528         bat_priv->hna_global_hash = NULL;
 529 }
 530
 531 struct orig_node *transtable_search(struct bat_priv *bat_priv, uint8_t *addr)
 532 {
 533         struct hna_global_entry *hna_global_entry;
 534
 535         spin_lock_bh(&bat_priv->hna_ghash_lock);
 536         rcu_read_lock();
 537         hna_global_entry = (struct hna_global_entry *)
 538                                 hash_find(bat_priv->hna_global_hash,
 539                                           compare_orig, choose_orig, addr);
 540         rcu_read_unlock();
 541         spin_unlock_bh(&bat_priv->hna_ghash_lock);
 542
 543         if (!hna_global_entry)
 544                 return NULL;
 545
 546         return hna_global_entry->orig_node;
 547 }